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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
âºâº Definition: Electron volt. In physics, the electron volt (eV) is a unit of energy. By definition, it is equal to the amount of kinetic energy gained by a single unbound electron when it accelerates through an electrostatic potential difference of one volt.âº Definition: Electron volt. In physics, the electron volt (eV) is a unit of energy. By definition, it is equal to the amount of kinetic energy gained by a single unbound electron when it accelerates through an electrostatic potential difference of one volt.